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Fabrication of hierarchically porous silica nanospheres through sol–gel process and pseudomorphic transformation

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Abstract

Hierarchically porous silica nanospheres with well-defined morphology and uniform particle size had been synthesized through a multistep sol–gel method combined with pseudomorphic transformation in the presence of polyvinylpyrrolidone (PVP) and cetyltrimethylammoium bromide (CTAB) as dual template. The prepared materials were characterized by small-angle X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and nitrogen physical adsorption techniques. The preparation process and the origin of hierarchical structure were also investigated. It had been shown that the hierarchical structure of synthesized materials comprises wormlike framework mesopores with diameters of about 3 nm and bubble-like pores with diameters of 20–30 nm. CTAB and PVP behave as dual-template and are responsible for the formation of the mesopores and big pores, respectively. Not only the porous structure, but also the morphology and particle size of hierarchical materials can be adjusted by controlling the addition of PVP. In addition, the formation process of hierarchically porous silica was investigated by transmission electron microscopy, FT-IR spectra and thermo-gravimetric curves and a possible synthetic mechanism had been proposed.

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Acknowledgments

The financial support obtained from the Chinese Academy of Sciences for “100 Talents” Project, the National Natural Science Foundation of China (No. 11079036, 21003124) and the Natural Science Foundation of Liaoning Province (No. 20092173) is greatly acknowledged.

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Correspondence to Junhu Wang.

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Jin, C., Wang, J., Wang, Y. et al. Fabrication of hierarchically porous silica nanospheres through sol–gel process and pseudomorphic transformation. J Sol-Gel Sci Technol 70, 53–61 (2014). https://doi.org/10.1007/s10971-014-3273-0

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